API: Rig up mutation { delete }

api/graph/schema.resolvers.go

@@ -206,7 +206,25 @@ func (r *mutationResolver) Update(ctx context.Context, id string, visibility mod
 }
 
 func (r *mutationResolver) Delete(ctx context.Context, id string) (*model.Paste, error) {
-	panic(fmt.Errorf("not implemented"))
+	var paste model.Paste
+
+	if err := database.WithTx(ctx, nil, func(tx *sql.Tx) error {
+		row := tx.QueryRowContext(ctx, `
+			DELETE FROM paste
+			WHERE sha = $1 AND user_id = $2
+			RETURNING
+				id, sha, created, user_id, visibility;`,
+			id, auth.ForContext(ctx).UserID)
+		return row.Scan(&paste.PKID, &paste.ID,
+			&paste.Created, &paste.UserID, &paste.RawVisibility)
+	}); err != nil {
+		if err == sql.ErrNoRows {
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	return &paste, nil
 }
 
 func (r *pasteResolver) Files(ctx context.Context, obj *model.Paste) ([]*model.File, error) {

pastesrht/alembic/versions/a9cfba1cedba_add_cascade_to_paste_file.py

@@ -0,0 +1,37 @@
+"""Add cascade to paste_file
+
+Revision ID: a9cfba1cedba
+Revises: 72db8bd163a7
+Create Date: 2021-09-21 14:39:05.297771
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'a9cfba1cedba'
+down_revision = '72db8bd163a7'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.execute("""
+    ALTER TABLE paste_file
+    DROP CONSTRAINT paste_file_paste_id_fkey;
+
+    ALTER TABLE paste_file
+    ADD CONSTRAINT paste_file_paste_id_fkey
+    FOREIGN KEY (paste_id) REFERENCES paste(id)
+    ON DELETE CASCADE;
+    """)
+
+
+def downgrade():
+    op.execute("""
+    ALTER TABLE paste_file
+    DROP CONSTRAINT paste_file_paste_id_fkey;
+
+    ALTER TABLE paste_file
+    ADD CONSTRAINT paste_file_paste_id_fkey
+    FOREIGN KEY (paste_id) REFERENCES paste(id);
+    """)

pastesrht/types/paste.py

@@ -44,7 +44,8 @@ class PasteFile(Base):
     blob = sa.orm.relationship("Blob")
 
     paste_id = sa.Column(sa.Integer,
-            sa.ForeignKey('paste.id'), nullable=False)
+            sa.ForeignKey('paste.id', ondelete="CASCADE"),
+            nullable=False)
     paste = sa.orm.relationship("Paste",
             backref=sa.orm.backref("files",
                 cascade="save-update, merge, delete"))